US20220389149A1 - Composition and cured product of same - Google Patents

Composition and cured product of same Download PDF

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Publication number
US20220389149A1
US20220389149A1 US17/760,980 US202017760980A US2022389149A1 US 20220389149 A1 US20220389149 A1 US 20220389149A1 US 202017760980 A US202017760980 A US 202017760980A US 2022389149 A1 US2022389149 A1 US 2022389149A1
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formula
compound
group
polyol
composition
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Takashi Konno
Naritoshi MAETSU
Jun Watanabe
Shintarou HATANAKA
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Daicel Corp
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Daicel Corp
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Assigned to DAICEL CORPORATION reassignment DAICEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HATANAKA, Shintarou, KONNO, TAKASHI, WATANABE, JUN, MAETSU, Naritoshi
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/46—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen
    • C08G18/4615—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen containing nitrogen
    • C08G18/4638—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen containing nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
    • C08G18/4661—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen containing nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring containing three nitrogen atoms in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
    • C08G18/3842—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
    • C08G18/3851—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring containing three nitrogen atoms in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4202—Two or more polyesters of different physical or chemical nature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
    • C08G18/4269—Lactones
    • C08G18/4277—Caprolactone and/or substituted caprolactone
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/44—Polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/61—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
    • C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C08L75/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L85/00—Compositions of macromolecular compounds obtained by reactions forming a linkage in the main chain of the macromolecule containing atoms other than silicon, sulfur, nitrogen, oxygen and carbon; Compositions of derivatives of such polymers
    • C08L85/04—Compositions of macromolecular compounds obtained by reactions forming a linkage in the main chain of the macromolecule containing atoms other than silicon, sulfur, nitrogen, oxygen and carbon; Compositions of derivatives of such polymers containing boron
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20—Diluents or solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
    • C08G77/46—Block-or graft-polymers containing polysiloxane sequences containing polyether sequences
    • C—CHEMISTRY; METALLURGY
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C08J2375/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes

Definitions

  • the present disclosure relates to a composition for polyurethane resin molding and a cured product of the same.
  • the present application claims priority from the Japanese Patent Application No. 2019-168879, filed in Japan on Sep. 17, 2019, the contents of which are incorporated herein by reference.
  • Polyurethane resins have flexibility, elasticity, and strength. Thus, compositions for polyurethane resin molding are used in coating agents and the like.
  • the coating agents are used, for example, to cover plastic substrates constituting vehicle parts, electronic devices, and the like, and such a coating agent is required to form a coating having adhesion to the substrate, hardness, and scratch resistance properties.
  • a coating agent include compositions described in Patent Documents 1 and 2.
  • an object of the present disclosure is to provide a composition capable of forming a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance.
  • Another object of the present disclosure is to provide a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance.
  • Yet another object of the present disclosure is to provide vehicle parts having at least a portion of their surfaces is covered with a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance.
  • Still another object of the present disclosure is to provide a housing having at least a portion of its surface is covered with a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance, and an electronic device including the housing.
  • a polyurethane resin obtained by reacting a polyol compound having an isocyanurate skeleton with a polyisocyanate compound having an isocyanurate skeleton has excellent adhesion to a substrate, hardness, and scratch resistance, as well as excellent chemical resistance.
  • the present disclosure was completed based on these findings.
  • the present disclosure provides a composition containing a polyol compound (A) and an isocyanate compound (B), the polyol compound (A) containing a compound (a1) having a number average molecular weight calibrated with polystyrene standards of less than 800, the compound (a1) being represented by Formula (1):
  • R 1 to R 3 are a group represented by Formula (1a):
  • L 1 and L 2 each identical or different, represent an alkylene group having from 1 to 10 carbon atom(s), and m represents a number of 0 or greater, except m does not simultaneously take 0 for R 1 to R 3 , and a bond with a wavy line binds to a nitrogen atom in the formula;
  • L 3 to L 5 each identical or different, represent a hydrogen atom, an NCO group, or an alkyl group having from 1 to 10 carbon atom(s) and having a group represented by Formula (2′), except L 3 to L 5 do not simultaneously take 0:
  • L 6 and L 7 each identical or different, represent an alkylene group having from 1 to 10 carbon atom(s), and a bond with a wavy line binds to a carbon atom of the alkyl group having from 1 to 10 carbon atom(s) in L 3 to L 5 in Formula (2).
  • the present disclosure also provides the composition described above, in which the polyol compound (A) further contains a polyol (a2) in an amount ranging from 0.01 to 1.5 parts by weight relative to 1 part by weight of the compound (a1), the polyol (a2) having a hydroxyl value (KOH mg/g) from 30 to 300.
  • a polyol (a2) in an amount ranging from 0.01 to 1.5 parts by weight relative to 1 part by weight of the compound (a1), the polyol (a2) having a hydroxyl value (KOH mg/g) from 30 to 300.
  • the present disclosure also provides the composition described above, in which an equivalent ratio of an NCO group in the isocyanate compound (B) to an OH group in the polyol compound (A), that is NCO/OH, is in a range from 0.2 to 2.0.
  • the present disclosure also provides the composition described above, further containing a polysiloxane derivative (C) in an amount from 0.1 to 0.5 parts by weight relative to 100 parts by weight of a total of the polyol compound (A) and the isocyanate compound (B).
  • the present disclosure also provides the composition described above, further containing a solvent represented by Formula (3):
  • R 4 and R 6 each identical or different, represent a hydrogen atom or an alkyl group having from 1 to 5 carbon atom(s), R 5 represents an alkylene group having from 1 to 5 carbon atom(s), represents an integer of 1 or greater, and t represents 0 or 1, and when s is an integer of 2 or greater, each of a plurality of R 5 may be identical or different.
  • the present disclosure also provides the composition described above, in which the composition is a coating agent.
  • the present disclosure also provides a cured product of the composition described above.
  • the present disclosure also provides a plastic molded product, having at least a portion of its surface being covered with a coating including the cured product described above.
  • composition of the present disclosure can form a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance.
  • a coating agent to cover a substrate enables the substrate to have those properties described above.
  • the plastic molded product having at least a portion of its surface being covered with the cured product of the composition of the present disclosure has high surface hardness, excellent scratch resistance and chemical resistance.
  • the plastic cured product covering the surface does not cause the plastic cured product covering the surface to peel off or whiten, enabling the plastic molded product to retain excellent appearance, adhesion, hardness, and scratch resistance over a long period of time.
  • composition of the present disclosure contains a polyol compound (A) and an isocyanate compound (B).
  • the composition of the present disclosure may contain an additional component other than the above components.
  • the polyol compound (A) is a compound having a plurality of hydroxyl groups.
  • the polyol compound (A) contains at least a polyester polyol compound (a1) represented by Formula (1):
  • R 1 to R 3 in the formula, each identical or different, are a group represented by Formula (1a):
  • L 1 and L 2 each identical or different, represent an alkylene group having from 1 to 10 carbon atom(s), and m represents a number of 0 or greater, except m does not simultaneously take 0 for R 1 to R 3 , and a bond with a wavy line binds to a nitrogen atom in the formula.
  • alkylene group having from 1 to 10 carbon atom(s) in L 1 and L 2 examples include linear or branched alkylene groups, such as a methylene group, a methylmethylene group, a dimethylmethylene group, an ethylene group, a propylene group, a trimethylene group, a butylene group, a 1-methyltrimethylene group, a 2-methyltrimethylene group, a 1,1′-dimethylethylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a 2-ethylhexylene group, a nonylene group, and a decylene group.
  • linear or branched alkylene groups such as a methylene group, a methylmethylene group, a dimethylmethylene group, an ethylene group, a propylene group, a trimethylene group, a butylene group, a 1-methyltrimethylene group, a 2-methyltrimethylene
  • L 1 is, among others, preferably an alkylene group having from 1 to 3 carbon atom(s).
  • L 2 is, among others, preferably an alkylene group having from 1 to 8 carbon atom(s) and particularly preferably an alkylene group having from 4 to 6 carbon atoms.
  • the alkylene group is preferably a linear alkylene group.
  • m described above is an average value of the degree of polymerization for the unit indicated with parentheses in Formula (1a) and is a number of 0 or greater, for example, from 0 to 7, preferably from 0 to 4, more preferably from 0 to 3, even more preferably from 0 to 2, and particularly preferably from 1 to 2.
  • the number average molecular weight of the compound (a1) (Mn, calibrated with polystyrene standards) is less than 800, preferably from 570 to 630, more preferably from 580 to 620, and even more preferably from 590 to 610.
  • a molecular weight dispersity (weight average molecular weight Mw/number average molecular weight Mn) of the compound (a1) is preferably from 1.0 to 1.5, more preferably from 1.0 to 1.3, and even more preferably from 1.0 to 1.2.
  • the hydroxyl value (KOH mg/g) of the compound (a1) is, for example, from 200 to 400, and in particular, from the viewpoint of improving the hardness and chemical resistance of the resulting cured product, the hydroxyl value is preferably from 260 to 300, more preferably from 270 to 290, and even more preferably from 275 to 285.
  • the hydroxyl value can be measured by the hydroxyl value measurement method described in JIS-K1557.
  • the compound (a1) can be produced, for example, by ring-opening polymerization of the lactone using the hydroxyl group of Formula (1′) below as a starting point.
  • L 1 in Formula (1′) is the same as L 1 in Formula (1a).
  • lactone examples include ⁇ -acetolactone, ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -valerolactone, and ⁇ -caprolactone.
  • the polyol compound (A) may contain an additional polyol compound other than the compound (a1).
  • additional polyol compound include polyester polyols other than the compound (a1), polyether polyols, and polycaprolactone polyols. These can be used alone, or in a combination of two or more.
  • Examples of the additional polyol compound include a polyol (a2) with a hydroxyl value (KOH mg/g) from 30 to 300.
  • the composition containing the polyol (a2) tends to improve the flexibility of the resulting cured product.
  • the hydroxyl value (KOH mg/g) of the polyol (a2) is preferably from 30 to 300, more preferably from 40 to 270, and even more preferably from 50 to 250. With the hydroxyl value (KOH mg/g) of the polyol (a2) less than 30, the composition will be unlikely to achieve good scratch resistance and chemical resistance for the resulting cured product, and with the hydroxyl value (KOH mg/g) of the polyol (a2) exceeding 300, the composition will be unlikely to achieve sufficient flexibility for the resulting cured product.
  • the hydroxyl value can be measured by the hydroxyl value measurement method described in JIS-K1557.
  • the number average molecular weight of the compound (a2) (Mn, calibrated with polystyrene standards) is, for example, preferably from 400 to 2500, more preferably from 450 to 2400, even more preferably from 500 to 2300, and particularly preferably from 500 to 2200.
  • the molecular weight dispersity (weight average molecular weight Mw/number average molecular weight Mn) of the polyol (a2) is, for example, from 1 to 3.
  • the polyol (a2) is preferably a polycarbonate polyol, a polyester polyol, and/or a copolymer of these, and more preferably two hydroxy groups are contained in the molecule.
  • the polycarbonate polyol can be obtained by reacting a carbonic acid derivative such as, for example, diphenyl carbonate, dimethyl carbonate, diethyl carbonate, or phosgene.
  • a carbonic acid derivative such as, for example, diphenyl carbonate, dimethyl carbonate, diethyl carbonate, or phosgene.
  • diol examples include aliphatic diols having no alicyclic skeleton, such as ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2-methyl-1,3-propane diol; aliphatic diols having an alicyclic skeleton, such as cyclohexanedimethanol, hydrogenated bisphenol A, hydrogenated bisphenol F, tricyclodecane dimethanol, and hydrogenated bisphenol A.
  • aliphatic diols having no alicyclic skeleton such as ethylene glycol, di
  • the polyester polyol can be obtained by ring-opening polymerization of the lactone or by reacting a diol with a dicarboxylic acid.
  • polyester polyol polylactone polyol
  • lactone polyol examples include ⁇ -acetolactone, ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -valerolactone, and ⁇ -caprolactone.
  • diol examples include those similar to the diol to be used to form the polycarbonate polyol.
  • dicarboxylic acid examples include oxalic acid, adipic acid, sebacic acid, fumaric acid, malonic acid, succinic acid, glutaric acid, azelaic acid, citric acid, 2,6-naphthalene dicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid, citraconic acid, 1,10-decanedicarboxylic acid, methyl hexahydrophthalic anhydride, hexahydrophthalic anhydride, methyl tetrahydrophthalic anhydride, and tetrahydrophthalic anhydride.
  • the copolymer can be obtained by copolymerizing the lactone, diol, dicarboxylic acid, and carbonic acid derivative described above.
  • the content of the polyol (a2) in the polyol compound (A) is not particularly limited, but from the viewpoint of improving the flexibility of the resulting cured product, the content is preferably from 0.01 to 1.5 parts by weight, more preferably from 0.03 to 1.2 parts by weight, even more preferably from 0.05 to 1.0 parts by weight, and particularly preferably from 0.08 to 0.9 parts by weight relative to 1 part by weight of the polyol compound (a1).
  • the content of the polyol (a2) in the polyol compound (A) is not particularly limited, but from the viewpoint of improving the flexibility of the resulting cured product, the content is preferably from 0.01 to 2.5 mol, more preferably from 0.03 to 2.0 mol, even more preferably from 0.05 to 1.5 mol, and particularly preferably from 0.08 to 1.0 mol per mol of the polyol compound (a1).
  • the number average molecular weight and the molecular weight dispersity of the polyol compound (A) can be measured with instruments and conditions described in Examples.
  • the isocyanate compound (B) contains at least an isocyanate compound (b) represented by Formula (2):
  • L 3 to L 5 each identical or different, represent a hydrogen atom, an NCO group, or an alkyl group having from 1 to 10 carbon atom(s) and having a group represented by Formula (2′), except L 3 to L 5 do not simultaneously take hydrogen atoms:
  • L 6 and L 7 each identical or different, represent an alkylene group having from 1 to 10 carbon atom(s), and a bond with a wavy line binds to a carbon atom of the alkyl group having from 1 to 10 carbon atom(s) in L 3 to L 5 in Formula (2).
  • the alkyl group having from 1 to 10 carbon atom(s) in the L 3 to L 5 described above is preferably an alkyl group corresponding to the alkylene group L 2 in Formula (1a).
  • L 3 to L 5 described above are preferably an alkyl group having from 3 to 8 carbon atoms, and more preferably an alkyl group having from 4 to 8 carbon atoms.
  • the alkyl group is preferably a linear alkyl group.
  • Examples of the alkylene group having from 1 to 10 carbon atom(s) in L 6 and L 7 described above include linear or branched alkylene groups, such as a methylene group, an ethylene group, a trimethylene group, a propylene group, a dimethylmethylene group, an isopropylene group, a butylene group, a 1-methyltrimethylene group, a 2-methyltrimethylene group, a 1,1′-dimethylethylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a 2-ethylhexylene group, a nonylene group, and a decylene group.
  • a linear alkylene group is preferred.
  • the NCO content in the isocyanate compound (b) is, for example, from 17 to 25 wt. %, preferably from 18 to 24 wt. %, and more preferably from 19 to 23 wt. %.
  • the isocyanate compound (B) may contain one, or two or more additional isocyanate compound(s) other than the isocyanate compound (b).
  • additional isocyanate compound include aliphatic polyisocyanates, such as 1,6-hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate; trimers of the aliphatic polyisocyanate (excluding the isocyanate compound (b)); allophanates, biurets, or adducts of the aliphatic polyisocyanate; aromatic polyisocyanates, such as triylene diisocyanate, xylylene diisocyanate, and diphenylmethane diisocyanate; alicyclic polyisocyanates, such as polyisocianates obtained by hydrogenating an aromatic polyisocianate, 4,4′-dicyclohexylmethane diisocyanate, and isophorone
  • the isocyanate compound (B) contains the isocyanate compound (b), for example, in an amount of preferably 60 wt. % or higher (more preferably 70 wt. % or higher, even more preferably 80 wt. % or higher, and particularly preferably 90 wt. % or higher) relative to the total amount of the isocyanate compound (B) from the viewpoint of improving the hardness and chemical resistance of the resulting cured product.
  • the composition of the present disclosure contains a polyol compound (A) and an isocyanate compound (B).
  • the equivalent ratio of the isocyanate group (NCO group) contained in the isocyanate compound (B) to the hydroxyl group (OH group) contained in the polyol compound (A), that is NCO/OH is preferably in a range from 0.2 to 2.0, more preferably from 0.5 to 1.5, even more preferably from 0.7 to 1.3, and particularly preferably from 0.9 to 1.2.
  • the content of the isocyanate compound (B) in the composition is preferably from 40 to 140 parts by weight, more preferably from 50 to 130 parts by weight, and even more preferably from 60 to 120 parts by weight relative to 100 parts by weight of the polyol compound (A), from the viewpoint of improving the hardness and chemical resistance of the resulting cured product.
  • composition of the present disclosure may further contain as necessary an inorganic particle, an organic particle, an additive, or the like.
  • Inorganic particles that the composition of the present disclosure may further contain are not particularly limited, but examples include silica, alumina, mica, synthetic mica, talc, calcium oxide, calcium carbonate, zirconium oxide, titanium oxide, barium titanate, kaolin, bentonite, diatomaceous earth, boron nitride, aluminum nitride, silicon carbide, zinc oxide, cerium oxide, cesium oxide, magnesium oxide, glass beads, glass fibers, graphite, carbon nanotubes, calcium hydroxide, magnesium hydroxide, and aluminum hydroxide.
  • silica is preferred.
  • Organic particles that the composition of the present disclosure may further contain are not particularly limited, but examples include polyethylene wax, polypropylene wax, acrylic beads, and urethane beads. Among these, from the viewpoint of improving the texture (soft feel properties) of the coating film, a urethane bead is preferred.
  • one type of these particles can be used alone or two or more types can be used in combination.
  • the particle sizes of the inorganic particles and the organic particles are not particularly limited but are, for example, preferably from 0.01 nm to 1 ⁇ m from the viewpoint of good appearance.
  • composition of the present disclosure may further contain include surfactants, pigments, dyes, ultraviolet absorbers, light stabilizers, surface modifiers, antifoaming agents, wetting agents, dispersants, viscoelasticity modifiers, thixotropy-imparting agents, antiseptics, film-forming agents, plasticizers, penetrants, perfumes, bactericides, fungicides, ultraviolet absorbers, antioxidants, antistatic agents, flame retardants, and matting agents.
  • surfactants include surfactants, pigments, dyes, ultraviolet absorbers, light stabilizers, surface modifiers, antifoaming agents, wetting agents, dispersants, viscoelasticity modifiers, thixotropy-imparting agents, antiseptics, film-forming agents, plasticizers, penetrants, perfumes, bactericides, fungicides, ultraviolet absorbers, antioxidants, antistatic agents, flame retardants, and matting agents.
  • a surface modifier is preferred from the viewpoint of smoothing the coating film surface.
  • the surface modifier include a polysiloxane derivative (C).
  • Examples of the polysiloxane derivative (C) include compounds having a polydimethylsiloxane skeleton.
  • a polyether-modified polydimethylsiloxane is preferred, and in particular, a polyethylene oxide (or polypropylene oxide) addition polydimethylsiloxane is preferred.
  • the content of the polysiloxane derivative (C) is, for example, from 0.1 to 0.5 parts by weight relative to 100 parts by weight of a total of the polyol compound (A) and the isocyanate compound (B).
  • the content of the inorganic particle or the additive in the composition of the present disclosure is not particularly limited but is preferably 10 wt. % or lower relative to a total weight (100 wt. %) of non-volatile content of the composition.
  • the solvent is represented, for example, by Formula (3):
  • R 4 and R 6 each identical or different, represent a hydrogen atom or an alkyl group having from 1 to 5 carbon atom(s), R 5 represents an alkylene group having from 1 to 5 carbon atom(s), s represents an integer of 1 or greater, t represents 0 or 1, and when s is an integer of 2 or greater, each of a plurality of R 5 may be identical or different.
  • alkyl group having from 1 to 5 carbon atom(s) in R 4 and R 6 examples include linear or branched alkyl groups, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an iso-butyl group, a s-butyl group, a t-butyl group, and a pentyl group.
  • Examples of the alkylene group having from 1 to 5 carbon atom(s) in R 5 include examples similar to those for L 2 in Formula (1a).
  • Examples of the solvent represented by Formula (3) include mono or poly(oxy C 1-6 alkylene) glycols, such as ethylene glycol, propylene glycol, butylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, and triethylene glycol; mono or poly(oxy C 1-6 alkylene) glycol mono(C 1-4 alkyl ether)s, such as ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, and dipropylene glycol monobutyl ether; mono or poly(oxy C 1-6 alkylene) glycol di(C 1-4
  • the solvent represented by Formula (3) is preferably a mono or poly(oxy C 1-6 alkylene) glycol mono(C 1-4 alkyl ether) mono(C 1-4 alkyl ester), and particularly a mono or poly(oxyethylene) glycol monoethyl ether monoacetate from the viewpoint of high solubility and excellent handleability.
  • a different solvent other than the solvent represented by Formula (3) above may be used in the composition of the present disclosure.
  • the different solvent include ester-based solvents, such as acetate esters (such as ethyl acetate and butyl acetate); ether-based solvents, such as dioxane and tetrahydrofuran; ketone-based solvents, such as acetone; aromatic solvents, such as toluene and xylene; halogen-based solvents, such as dichloromethane and chloroform; alcohol-based solvents, such as methanol, ethanol, isopropanol, and butanol; and nitrile-based solvents, such as acetonitrile and benzonitrile. These can be used alone, or in a combination of two or more.
  • the content of the solvent (e.g., the solvent represented by Formula (3)) in the composition of the present disclosure is set to give a solid content concentration in the composition in a range from, for example, 70 to 99 wt. % (preferably 80 to 95 wt. %).
  • the content of the solvent is preferably from 5 to 20 parts by weight, more preferably from 7 to 17 parts by weight, and even more preferably from 9 to 15 parts by weight relative to 100 parts by weight of a total of the polyol compound (A) and the isocyanate compound (B).
  • composition of the present disclosure can be produced by mixing the above components.
  • the composition of the present disclosure is preferably used as a two-component coating agent, where the polyol compound (A) and the isocyanate compound (B) are preferably separately stored and mixed at the time of use.
  • composition of the present disclosure has the above configuration, and thus subjecting the composition to heat treatment enables the polyol compound (A) and the isocyanate compound (B) to be urethane-bonded to form a cured product (i.e., a cured product including a polyurethane resin).
  • the heat treatment conditions are, for example, at 100 to 150° C. for approximately 0.5 to 12 hours.
  • the cured product may be further aged at a temperature of room temperature (from 1 to 30° C.) for approximately 12 to 60 hours.
  • the cured product thus obtained has excellent adhesion to a substrate (e.g., a plastic substrate, such as those of PET) and excellent scratch resistance.
  • a substrate e.g., a plastic substrate, such as those of PET
  • the cured product has a high hardness, and the pencil hardness (by a method in accordance with JIS K5600) of, for example, H or higher, preferably 2H or higher, particularly preferably 3H or higher, and even more preferably 4H or higher.
  • the Martens hardness of the cured product is, for example, higher than 5.0 and 75.0 or lower, and preferably from 5.3 to 60.0.
  • the cured product has excellent chemical resistance; for example, a sunscreen adhered to the cured product does not make the surface swell, or cause white cloudiness to occur. That is, the cured product has excellent sunscreen resistance.
  • the cured product has the above properties in combination.
  • the composition for forming the cured product is suitable as a coating agent for plastic molded products, such as extrusion-molded products, injection-molded products, and compression-molded products; and as a material for molded products, such as films.
  • the plastic molded product include parts for constituting housings of home electric appliances (such as refrigerators, washing machines, air conditioners, and television sets), housings of electronic devices (such as personal computers, mobile phones, and smartphones), and parts for constituting musical instruments (such as pianos, electronic organs, and electronic musical instruments); and parts for vehicles, such as automobiles and railway vehicles, (interior materials, such as instrument panels, door trims, headlinings, and tonneau covers; and exterior materials, such as bumpers).
  • examples of the plastic forming the plastic molded product include thermoplastic resins and thermosetting resins.
  • thermoplastic resin examples include polyolefin-based resins, such as polyethylenes and polypropylenes; styrene-based resins, such as polystyrenes; polyesters, such as poly(ethylene terephthalate)s (PETs); vinyl chloride-based resins, such as vinyl chloride resins; polyamides, such as polyamide 46, polyamide 6, polyamide 66, polyamide 610, polyamide 612, polyamide 1010, polyamide 1012, polyamide 11, polyamide 12, and polyamide 1212; poly(phenylene ether)s, such as poly(2,6-dimethyl-1,4-phenylene ether); homopolymers or copolymers of acrylonitrile, such as PAN resins, AS resins, ABS resins, AAS resins, ACS resins, AES resins, and AXS resins; and (meth)acrylic resins, polycarbonates, polyacetals, poly(phenylene sulfide)s, poly(ether ether)
  • thermosetting resin examples include phenol resins, urea resins, melamine resins, unsaturated polyesters, furan resins, epoxy resins, polyurethanes, allyl resins, and polyimides.
  • a plastic molded product formed from a coating including the cured product of the present disclosure on at least a portion of the surface has excellent scratch resistance, chemical resistance, and the like.
  • the thickness of the coating is not particularly limited and is, for example, approximately from 20 to 150 ⁇ m.
  • the plastic molded product formed using the composition itself as a material has a surface including the cured product and thus likewise also has excellent scratch resistance, chemical resistance, and the like.
  • the concentration of the residual ⁇ -caprolactone was determined to be less than 1.0% by gas chromatographic analysis, and then the mixture was cooled and taken out of the five-neck flask.
  • the resulting compound (a1-1) had a number average molecular weight (Mn) of 611, a molecular weight dispersity (Mw/Mn) of 1.2, and a viscosity of 14.3 [Pa ⁇ s/25° C.].
  • the number average molecular weight (Mn) and weight average molecular weight (Mw) were determined by comparison with polystyrene standards using a high-speed GPC apparatus, and the molecular weight dispersity (Mw/Mn) was calculated.
  • the measurement conditions were as follows.
  • Measuring apparatus a high-speed GPC apparatus “HLC-8220GPC”, available from Tosoh Corporation
  • a polyol compound (A), an isocyanate compound (B), a surface modifier, and a solvent were placed as described in Table 1, mixed, and defoamed.
  • the resulting composition was applied to a polyethylene terephthalate film (Cosmoshine A4100 #100, available from Toyobo Co., Ltd.) to give a coating thickness of 90 ⁇ m using an applicator, cured and dried in an oven at 120° C. for two hours, further cured under constant temperature and humidity conditions of 23° C. and 50% RH for 48 hours, and a cured coating/PET film laminate was obtained accordingly.
  • a polyethylene terephthalate film Cosmoshine A4100 #100, available from Toyobo Co., Ltd.
  • compositions were obtained in the same manner as in Example 1 except that the formulations of the compositions were changed as described in Table 1.
  • the cured coatings of the laminates obtained in the examples and comparative examples were evaluated for pencil hardness, Martens hardness, scratch resistance, and sunscreen resistance by the following methods.
  • the pencil hardness of the surface on the cured coating side of the laminates obtained in the examples and comparative examples was evaluated by the method in accordance with JIS K5600. That is, the surface on the cured side of the laminate was rubbed with a pencil (pencil lead), and a laminate in which a scratch was observed on the surface was determined to be NG (poor). Specifically, the evaluation was performed using a pencil with a predetermined hardness, and when no scratch was made, another evaluation was performed with a pencil with a hardness one grade higher, and this operation was repeated. Once a scratch was observed, the laminate was re-evaluated with a hardness one grade lower, and when no scratch was observed, the laminate was evaluated again using a pencil with a hardness one grade higher.
  • the hardness of the hardest pencil with which no scratch was made was determined as the pencil hardness of the cured coating.
  • those laminates subjected to moisture control under a constant temperature and humidity chamber at 23° C. and 50% RH for 24 hours were used.
  • Pencil for evaluation a “Pencil for Pencil Hardness Test” available from Mitsubishi Pencil Co., Ltd.
  • the Martens hardness of the surface on the cured coating side of the laminates obtained in the examples and comparative examples was measured using a Shimadzu Dynamic Ultra-Micro Hardness Tester DUH-211 (available from Shimadzu Corporation).
  • the Martens hardness is a value determined by the quotient of the test load and the surface area penetrated by an indenter and is an index of surface hardness.
  • a scratch test was performed by attaching a steel wool (B-204, Bonstar for commercial use #0000) to a rubbing tester (Standard Model, available from Nippon Rika Industries Corporation) and reciprocating the steel wool (10 reciprocations or 20 reciprocations) on the coating with a load of 500 g applied.
  • the initial gloss (60-degree gloss) (G 0 ) before the scratch test on the cured coating side surface and the gloss (60-degree gloss) (G 1 ) after 2 minutes of the scratch test were measured using a gloss meter (Gloss Meter VG7000, available from Nippon Denshoku Industries Co., Ltd.), and the scratch resistance was evaluated by calculating the retention rate of the gloss by the following equation.
  • the laminate after scratching was allowed to stand under constant temperature and humidity conditions of 23° C. and 50% RH for 24 hours, and the gloss (60-degree gloss) (G 2 ) of the coating after standing was measured, and the scratch recovery was evaluated by calculating the retention rate of the gloss to the initial gloss (60-degree gloss, G 0 ) by the following equation.
  • the entire surface on the cured coating side of a test specimen (rectangle, 2 cm 2 ) of the laminates obtained in the examples and comparative examples was brought into contact with 0.4 g of a sunscreen cream (“Ultra Sheer Dry-Touch SPF45” available from Neutrogena Corporation) weighed on a slide glass (contact area of the cured coating and the sunscreen cream: 0.1 g/cm 2 ).
  • the entire cured coating was covered with a polyvinylidene chloride film, and the test specimen was allowed to stand in an oven at 80° C. for 5 hours, then the sunscreen cream was wiped off, and the adhesive state of the cured coating was evaluated according to the criteria below. The following indicates that a cured coating harder to peel off had better adhesion to a substrate.
  • the cured test specimen was allowed to stand on a flat surface with the coating side surface of the cured test specimen on the back side, and the height (mm) of each vertex from the flat surface was measured. The total value for the heights of each of the vertex (four locations) was evaluated as a curl (mm).
  • a sunscreen cream (“Ultra Sheer Dry-Touch SPF45” available from Neutrogena Corporation) in an amount of 0.025 g/cm 2 , and the laminate was allowed to stand in an oven at 50° C. for one hour. The sunscreen cream was then wiped off, and the appearance of the cured coating was evaluated according to the following criteria.
  • the cured coatings for Comparative Examples 1 and 2 obtained using a triol having no isocyanurate skeleton in place of the polyol compound (a1) were rated excellent for scratch resistance but poor or slightly poor for sunscreen resistance (adhesiveness), exhibiting poor adhesion.
  • the cured coatings for Comparative Examples 3 to 6 obtained using only the polyol (a2) as the polyol compound (A) without using the polyol compound (a1) were rated poor or slightly poor in any of the evaluations of scratch resistance and sunscreen resistance, exhibiting insufficiency in any of adhesion, scratch resistance, or chemical resistance.
  • a1-1 a compound (a1-1) obtained by Synthesis Example 1
  • Solvent diethylene glycol monoethyl ether acetate, a reagent available from Tokyo Chemical Industry Co., Ltd.
  • a polyol (a2) in an amount ranging from 0.01 to 1.5 parts by weight relative to 1 part by weight of the compound (a1), the polyol (a2) having a hydroxyl value (KOH mg/g) from 30 to 300.
  • composition according to [11] The composition according to [10], in which the polyol (a2) is at least one selected from a polyester polyol, a polyether polyol, and a polycarbonate polyol.
  • composition according to [12] The composition according to [10], in which the polyol (a2) is at least one selected from a polyester polyol and a polycarbonate polyol.
  • the at least one isocyanate compound being selected from: 1,6-hexamethylene diisocyan
  • composition according to any one of [1] to [21], in which an equivalent ratio of an NCO group contained in the isocyanate compound (B) to an OH group contained in the polyol compound (A), that is NCO/OH, is in a range from 0.2 to 2.0 (preferably from 0.5 to 1.5, more preferably from 0.7 to 1.3, and even more preferably from 0.9 to 1.2).
  • a polydimethylsiloxane skeleton preferably a polyether-modified polydimethylsiloxane and more preferably a polyethylene oxide addition polydimethylsiloxane.
  • the solvent represented by Formula (3) is at least one selected from: ethylene glycol monoethyl ether acetate; ethylene glycol monopropyl ether acetate; ethylene glycol monobutyl ether acetate; diethylene glycol monoethyl ether acetate; diethylene glycol monobutyl ether acetate; propylene glycol monoethyl ether acetate
  • composition according to any one of [1] to [28], which is a coating agent is a coating agent.
  • a plastic molded product having at least a portion of a surface being covered with a coating including the cured product described in [30].
  • the composition of the present disclosure forms a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance, and thus using the composition as a coating agent to cover a substrate enables the substrate to have the properties described above.
  • the plastic molded product having at least a portion of its surface is covered with the cured product of the composition of the present disclosure has high surface hardness, excellent scratch resistance and chemical resistance.
  • touching the plastic molded product, for example, with a hand to which sunscreen has been applied does not peel off or whiten the plastic cured product covering its surface, and the plastic molded product retains excellent appearance, adhesion, hardness, and scratch resistance over a long period of time.

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